Modern marketing,

 began in the 1950s when people started to use more than just print media to endorse a product. As TV -- and soon, the internet -- entered households, marketers could conduct entire campaigns across multiple platforms. And as you might expect, over the last 70 years, marketers have become increasingly important to fine-tuning how a business sells a product to consumers to optimize success.

In fact, the fundamental purpose of marketing is to attract consumers to your brand through messaging. Ideally, that messaging will helpful and educational to your target audience so you can convert consumers into leads.

Today, there are literally dozens of places one can carry out a marketing campaign -- where does one do it in the 21st century?